code: def test_custom_crs():
      class CustomCRS:
          def to_wkt(self):
              return (
                  'GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",'
                  '6378137,298.257223563,AUTHORITY["EPSG","7030"]],'
                  'AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,'
                  'AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,'
                  'AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]]'
              )
  
      assert (
          crs.CRS.from_user_input(CustomCRS())
          .to_wkt()
          .startswith('GEOGCS["WGS 84"')
      )
  
file_path: Fiona/tests/test_crs.py
imports: import pytest
  from .conftest import requires_gdal33
  from fiona import crs
  from fiona.env import Env
  from fiona.errors import CRSError, FionaDeprecationWarning
label_desc: Use image node_id 8 for calling a global function with example usage: test_custom_crs() and returns: str